X.entropy: The entropy measure

Description Usage Arguments Value Author(s) References

View source: R/FeatureSelection.OtherFuncCollections.R

Description

An auxiliary function for the qualityF parameter in the FS.greedy.heuristic.reduct.RST, FS.DAAR.heuristic.RST and FS.greedy.heuristic.superreduct.RST functions. It is based on entropy as a measure of information(Shannon, 1948).

Usage

1
X.entropy(decisionDistrib)

Arguments

decisionDistrib

an integer vector corresponding to a distribution of attribute values

Value

a numeric value indicating entropy of an attribute.

Author(s)

Andrzej Janusz

References

C. E. Shannon, "A Mathematical Theory of Communication", Bell System Technical Journal, vol. 27, p. 379 - 423, 623 - 656 (1948).


RoughSets documentation built on May 29, 2017, 7:06 p.m.